/*
 * Copyright 1999-2021 Alibaba Group Holding Ltd.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.aliyun.odps.compiler;

import com.aliyun.odps.compiler.function.ResolvedFunctionSignature;

public class UsedFunctionDetector extends CaseDetector {

  @Override
  public Void visit(FunctionCall t, Void aVoid) {
    ResolvedFunctionSignature sig = TreeExt.sig(t);
    if (sig != null && sig.getTarget() != null && !sig.getTarget().isBuiltIn()) {
      emit("used.function", t);
    }
    return super.visit(t, null);
  }
}
